/*
 * djpeg.c
 *
 * Copyright (C) 1991-1997, Thomas G. Lane.
 * This file is part of the Independent JPEG Group's software.
 * For conditions of distribution and use, see the accompanying README file.
 *
 * This file contains a command-line user interface for the JPEG decompressor.
 * It should work on any system with Unix- or MS-DOS-style command lines.
 *
 * Two different command line styles are permitted, depending on the
 * compile-time switch TWO_FILE_COMMANDLINE:
 *	djpeg [options]  inputfile outputfile
 *	djpeg [options]  [inputfile]
 * In the second style, output is always to standard output, which you'd
 * normally redirect to a file or pipe to some other program.  Input is
 * either from a named file or from standard input (typically redirected).
 * The second style is convenient on Unix but is unhelpful on systems that
 * don't support pipes.  Also, you MUST use the first style if your system
 * doesn't do binary I/O to stdin/stdout.
 * To simplify script writing, the "-outfile" switch is provided.  The syntax
 *	djpeg [options]  -outfile outputfile  inputfile
 * works regardless of which command line style is used.
 */

#include "cdjpeg.h"		/* Common decls for cjpeg/djpeg applications */
#include "jversion.h"		/* for version message */
#include "ReadFile.h"
#include <ctype.h>		/* to declare isprint() */

#ifdef USE_CCOMMAND		/* command-line reader for Macintosh */
#ifdef __MWERKS__
#include <SIOUX.h>              /* Metrowerks needs this */
#include <console.h>		/* ... and this */
#endif
#ifdef THINK_C
#include <console.h>		/* Think declares it here */
#endif
#endif


/* Create the add-on message string table. */

#define JMESSAGE(code,string)	string ,

static const char * const cdjpeg_message_table[] = {
#include "cderror.h"
    NULL
};


/*
 * This list defines the known output image formats
 * (not all of which need be supported by a given version).
 * You can change the default output format by defining DEFAULT_FMT;
 * indeed, you had better do so if you undefine PPM_SUPPORTED.
 */

typedef enum {
    FMT_BMP,		/* BMP format (Windows flavor) */
    FMT_GIF,		/* GIF format */
    FMT_OS2,		/* BMP format (OS/2 flavor) */
    FMT_PPM,		/* PPM/PGM (PBMPLUS formats) */
    FMT_RLE,		/* RLE format */
    FMT_TARGA,		/* Targa format */
    FMT_TIFF		/* TIFF format */
} IMAGE_FORMATS;

#ifndef DEFAULT_FMT		/* so can override from CFLAGS in Makefile */
#define DEFAULT_FMT	FMT_PPM
#endif

static IMAGE_FORMATS requested_fmt;


/*
 * Argument-parsing code.
 * The switch parser is designed to be useful with DOS-style command line
 * syntax, ie, intermixed switches and file names, where only the switches
 * to the left of a given file name affect processing of that file.
 * The main program in this file doesn't actually use this capability...
 */


static const char * progname;	/* program name for error messages */
static char * outfilename;	/* for -outfile switch */


    LOCAL(void)
usage (void)
    /* complain about bad command line */
{
    fprintf(stderr, "usage: %s [switches] ", progname);
#ifdef TWO_FILE_COMMANDLINE
    fprintf(stderr, "inputfile outputfile\n");
#else
    fprintf(stderr, "[inputfile]\n");
#endif

    fprintf(stderr, "Switches (names may be abbreviated):\n");
    fprintf(stderr, "  -colors N      Reduce image to no more than N colors\n");
    fprintf(stderr, "  -fast          Fast, low-quality processing\n");
    fprintf(stderr, "  -grayscale     Force grayscale output\n");
#ifdef IDCT_SCALING_SUPPORTED
    fprintf(stderr, "  -scale M/N     Scale output image by fraction M/N, eg, 1/8\n");
#endif
#ifdef BMP_SUPPORTED
    fprintf(stderr, "  -bmp           Select BMP output format (Windows style)%s\n",
            (DEFAULT_FMT == FMT_BMP ? " (default)" : ""));
#endif
#ifdef GIF_SUPPORTED
    fprintf(stderr, "  -gif           Select GIF output format%s\n",
            (DEFAULT_FMT == FMT_GIF ? " (default)" : ""));
#endif
#ifdef BMP_SUPPORTED
    fprintf(stderr, "  -os2           Select BMP output format (OS/2 style)%s\n",
            (DEFAULT_FMT == FMT_OS2 ? " (default)" : ""));
#endif
#ifdef PPM_SUPPORTED
    fprintf(stderr, "  -pnm           Select PBMPLUS (PPM/PGM) output format%s\n",
            (DEFAULT_FMT == FMT_PPM ? " (default)" : ""));
#endif
#ifdef RLE_SUPPORTED
    fprintf(stderr, "  -rle           Select Utah RLE output format%s\n",
            (DEFAULT_FMT == FMT_RLE ? " (default)" : ""));
#endif
#ifdef TARGA_SUPPORTED
    fprintf(stderr, "  -targa         Select Targa output format%s\n",
            (DEFAULT_FMT == FMT_TARGA ? " (default)" : ""));
#endif
    fprintf(stderr, "Switches for advanced users:\n");
#ifdef DCT_ISLOW_SUPPORTED
    fprintf(stderr, "  -dct int       Use integer DCT method%s\n",
            (JDCT_DEFAULT == JDCT_ISLOW ? " (default)" : ""));
#endif
#ifdef DCT_IFAST_SUPPORTED
    fprintf(stderr, "  -dct fast      Use fast integer DCT (less accurate)%s\n",
            (JDCT_DEFAULT == JDCT_IFAST ? " (default)" : ""));
#endif
#ifdef DCT_FLOAT_SUPPORTED
    fprintf(stderr, "  -dct float     Use floating-point DCT method%s\n",
            (JDCT_DEFAULT == JDCT_FLOAT ? " (default)" : ""));
#endif
    fprintf(stderr, "  -dither fs     Use F-S dithering (default)\n");
    fprintf(stderr, "  -dither none   Don't use dithering in quantization\n");
    fprintf(stderr, "  -dither ordered  Use ordered dither (medium speed, quality)\n");
#ifdef QUANT_2PASS_SUPPORTED
    fprintf(stderr, "  -map FILE      Map to colors used in named image file\n");
#endif
    fprintf(stderr, "  -nosmooth      Don't use high-quality upsampling\n");
#ifdef QUANT_1PASS_SUPPORTED
    fprintf(stderr, "  -onepass       Use 1-pass quantization (fast, low quality)\n");
#endif
    fprintf(stderr, "  -maxmemory N   Maximum memory to use (in kbytes)\n");
    fprintf(stderr, "  -outfile name  Specify name for output file\n");
    fprintf(stderr, "  -verbose  or  -debug   Emit debug output\n");
    exit(EXIT_FAILURE);
}


    LOCAL(int)
parse_switches (j_decompress_ptr cinfo, int argc, char **argv,
        int last_file_arg_seen, boolean for_real)
/* Parse optional switches.
 * Returns argv[] index of first file-name argument (== argc if none).
 * Any file names with indexes <= last_file_arg_seen are ignored;
 * they have presumably been processed in a previous iteration.
 * (Pass 0 for last_file_arg_seen on the first or only iteration.)
 * for_real is FALSE on the first (dummy) pass; we may skip any expensive
 * processing.
 */
{
    int argn;
    char * arg;

    /* Set up default JPEG parameters. */
    requested_fmt = DEFAULT_FMT;	/* set default output file format */
    outfilename = NULL;
    cinfo->err->trace_level = 0;

    /* Scan command line options, adjust parameters */

    for (argn = 1; argn < argc; argn++) {
        arg = argv[argn];
        if (*arg != '-') {
            /* Not a switch, must be a file name argument */
            if (argn <= last_file_arg_seen) {
                outfilename = NULL;	/* -outfile applies to just one input file */
                continue;		/* ignore this name if previously processed */
            }
            break;			/* else done parsing switches */
        }
        arg++;			/* advance past switch marker character */

        if (keymatch(arg, "bmp", 1)) {
            /* BMP output format. */
            requested_fmt = FMT_BMP;

        } else if (keymatch(arg, "colors", 1) || keymatch(arg, "colours", 1) ||
                keymatch(arg, "quantize", 1) || keymatch(arg, "quantise", 1)) {
            /* Do color quantization. */
            int val;

            if (++argn >= argc)	/* advance to next argument */
                usage();
            if (sscanf(argv[argn], "%d", &val) != 1)
                usage();
            cinfo->desired_number_of_colors = val;
            cinfo->quantize_colors = TRUE;

        } else if (keymatch(arg, "dct", 2)) {
            /* Select IDCT algorithm. */
            if (++argn >= argc)	/* advance to next argument */
                usage();
            if (keymatch(argv[argn], "int", 1)) {
                cinfo->dct_method = JDCT_ISLOW;
            } else if (keymatch(argv[argn], "fast", 2)) {
                cinfo->dct_method = JDCT_IFAST;
            } else if (keymatch(argv[argn], "float", 2)) {
                cinfo->dct_method = JDCT_FLOAT;
            } else
                usage();

        } else if (keymatch(arg, "dither", 2)) {
            /* Select dithering algorithm. */
            if (++argn >= argc)	/* advance to next argument */
                usage();
            if (keymatch(argv[argn], "fs", 2)) {
                cinfo->dither_mode = JDITHER_FS;
            } else if (keymatch(argv[argn], "none", 2)) {
                cinfo->dither_mode = JDITHER_NONE;
            } else if (keymatch(argv[argn], "ordered", 2)) {
                cinfo->dither_mode = JDITHER_ORDERED;
            } else
                usage();

        } else if (keymatch(arg, "debug", 1) || keymatch(arg, "verbose", 1)) {
            /* Enable debug printouts. */
            /* On first -d, print version identification */
            static boolean printed_version = FALSE;

            if (! printed_version) {
                fprintf(stderr, "Independent JPEG Group's DJPEG, version %s\n%s\n",
                        JVERSION, JCOPYRIGHT);
                printed_version = TRUE;
            }
            cinfo->err->trace_level++;

        } else if (keymatch(arg, "fast", 1)) {
            /* Select recommended processing options for quick-and-dirty output. */
            cinfo->two_pass_quantize = FALSE;
            cinfo->dither_mode = JDITHER_ORDERED;
            if (! cinfo->quantize_colors) /* don't override an earlier -colors */
                cinfo->desired_number_of_colors = 216;
            cinfo->dct_method = JDCT_FASTEST;
            cinfo->do_fancy_upsampling = FALSE;

        } else if (keymatch(arg, "gif", 1)) {
            /* GIF output format. */
            requested_fmt = FMT_GIF;

        } else if (keymatch(arg, "grayscale", 2) || keymatch(arg, "greyscale",2)) {
            /* Force monochrome output. */
            cinfo->out_color_space = JCS_GRAYSCALE;

        } else if (keymatch(arg, "map", 3)) {
            /* Quantize to a color map taken from an input file. */
            if (++argn >= argc)	/* advance to next argument */
                usage();
            if (for_real) {		/* too expensive to do twice! */
#ifdef QUANT_2PASS_SUPPORTED	/* otherwise can't quantize to supplied map */
                FILE * mapfile;

                if ((mapfile = fopen(argv[argn], READ_BINARY)) == NULL) {
                    fprintf(stderr, "%s: can't open %s\n", progname, argv[argn]);
                    exit(EXIT_FAILURE);
                }
                read_color_map(cinfo, mapfile);
                fclose(mapfile);
                cinfo->quantize_colors = TRUE;
#else
                ERREXIT(cinfo, JERR_NOT_COMPILED);
#endif
            }

        } else if (keymatch(arg, "maxmemory", 3)) {
            /* Maximum memory in Kb (or Mb with 'm'). */
            long lval;
            char ch = 'x';

            if (++argn >= argc)	/* advance to next argument */
                usage();
            if (sscanf(argv[argn], "%ld%c", &lval, &ch) < 1)
                usage();
            if (ch == 'm' || ch == 'M')
                lval *= 1000L;
            cinfo->mem->max_memory_to_use = lval * 1000L;

        } else if (keymatch(arg, "nosmooth", 3)) {
            /* Suppress fancy upsampling */
            cinfo->do_fancy_upsampling = FALSE;

        } else if (keymatch(arg, "onepass", 3)) {
            /* Use fast one-pass quantization. */
            cinfo->two_pass_quantize = FALSE;

        } else if (keymatch(arg, "os2", 3)) {
            /* BMP output format (OS/2 flavor). */
            requested_fmt = FMT_OS2;

        } else if (keymatch(arg, "outfile", 4)) {
            /* Set output file name. */
            if (++argn >= argc)	/* advance to next argument */
                usage();
            outfilename = argv[argn];	/* save it away for later use */

        } else if (keymatch(arg, "pnm", 1) || keymatch(arg, "ppm", 1)) {
            /* PPM/PGM output format. */
            requested_fmt = FMT_PPM;

        } else if (keymatch(arg, "rle", 1)) {
            /* RLE output format. */
            requested_fmt = FMT_RLE;

        } else if (keymatch(arg, "scale", 1)) {
            /* Scale the output image by a fraction M/N. */
            if (++argn >= argc)	/* advance to next argument */
                usage();
            if (sscanf(argv[argn], "%d/%d",
                        &cinfo->scale_num, &cinfo->scale_denom) != 2)
                usage();

        } else if (keymatch(arg, "targa", 1)) {
            /* Targa output format. */
            requested_fmt = FMT_TARGA;

        } else {
            usage();			/* bogus switch */
        }
    }

    return argn;			/* return index of next arg (file name) */
}


/*
 * Marker processor for COM and interesting APPn markers.
 * This replaces the library's built-in processor, which just skips the marker.
 * We want to print out the marker as text, to the extent possible.
 * Note this code relies on a non-suspending data source.
 */

    LOCAL(unsigned int)
jpeg_getc (j_decompress_ptr cinfo)
    /* Read next byte */
{
    struct jpeg_source_mgr * datasrc = cinfo->src;

    if (datasrc->bytes_in_buffer == 0) {
        if (! (*datasrc->fill_input_buffer) (cinfo))
            ERREXIT(cinfo, JERR_CANT_SUSPEND);
    }
    datasrc->bytes_in_buffer--;
    return GETJOCTET(*datasrc->next_input_byte++);
}


    METHODDEF(boolean)
print_text_marker (j_decompress_ptr cinfo)
{
    boolean traceit = (cinfo->err->trace_level >= 1);
    INT32 length;
    unsigned int ch;
    unsigned int lastch = 0;

    length = jpeg_getc(cinfo) << 8;
    length += jpeg_getc(cinfo);
    length -= 2;			/* discount the length word itself */

    if (traceit) {
        if (cinfo->unread_marker == JPEG_COM)
            fprintf(stderr, "Comment, length %ld:\n", (long) length);
        else			/* assume it is an APPn otherwise */
            fprintf(stderr, "APP%d, length %ld:\n",
                    cinfo->unread_marker - JPEG_APP0, (long) length);
    }

    while (--length >= 0) {
        ch = jpeg_getc(cinfo);
        if (traceit) {
            /* Emit the character in a readable form.
             * Nonprintables are converted to \nnn form,
             * while \ is converted to \\.
             * Newlines in CR, CR/LF, or LF form will be printed as one newline.
             */
            if (ch == '\r') {
                fprintf(stderr, "\n");
            } else if (ch == '\n') {
                if (lastch != '\r')
                    fprintf(stderr, "\n");
            } else if (ch == '\\') {
                fprintf(stderr, "\\\\");
            } else if (isprint(ch)) {
                putc(ch, stderr);
            } else {
                fprintf(stderr, "\\%03o", ch);
            }
            lastch = ch;
        }
    }

    if (traceit)
        fprintf(stderr, "\n");

    return TRUE;
}


/*
 * The main program.
 */

    int
main (int argc, char **argv)
{
    struct jpeg_decompress_struct cinfo;
    struct jpeg_error_mgr jerr;
#ifdef PROGRESS_REPORT
    struct cdjpeg_progress_mgr progress;
#endif
    int file_index;
    djpeg_dest_ptr dest_mgr = NULL;
    FILE * input_file;
    FILE * output_file;
    JDIMENSION num_scanlines;
    void * sMem;
    int sSize;

    /* On Mac, fetch a command line. */
#ifdef USE_CCOMMAND
    argc = ccommand(&argv);
#endif

    progname = argv[0];
    if (progname == NULL || progname[0] == 0)
        progname = "djpeg";		/* in case C library doesn't provide it */

    /* Initialize the JPEG decompression object with default error handling. */
    cinfo.err = jpeg_std_error(&jerr);
    jpeg_create_decompress(&cinfo);
    /* Add some application-specific error messages (from cderror.h) */
    jerr.addon_message_table = cdjpeg_message_table;
    jerr.first_addon_message = JMSG_FIRSTADDONCODE;
    jerr.last_addon_message = JMSG_LASTADDONCODE;

    /* Insert custom marker processor for COM and APP12.
     * APP12 is used by some digital camera makers for textual info,
     * so we provide the ability to display it as text.
     * If you like, additional APPn marker types can be selected for display,
     * but don't try to override APP0 or APP14 this way (see libjpeg.doc).
     */
    jpeg_set_marker_processor(&cinfo, JPEG_COM, print_text_marker);
    jpeg_set_marker_processor(&cinfo, JPEG_APP0+12, print_text_marker);

    /* Now safe to enable signal catcher. */
#ifdef NEED_SIGNAL_CATCHER
    enable_signal_catcher((j_common_ptr) &cinfo);
#endif

    /* Scan command line to find file names. */
    /* It is convenient to use just one switch-parsing routine, but the switch
     * values read here are ignored; we will rescan the switches after opening
     * the input file.
     * (Exception: tracing level set here controls verbosity for COM markers
     * found during jpeg_read_header...)
     */

    file_index = parse_switches(&cinfo, argc, argv, 0, FALSE);

#ifdef TWO_FILE_COMMANDLINE
    /* Must have either -outfile switch or explicit output file name */
    if (outfilename == NULL) {
        if (file_index != argc-2) {
            fprintf(stderr, "%s: must name one input and one output file\n",
                    progname);
            usage();
        }
        outfilename = argv[file_index+1];
    } else {
        if (file_index != argc-1) {
            fprintf(stderr, "%s: must name one input and one output file\n",
                    progname);
            usage();
        }
    }
#else
    /* Unix style: expect zero or one file name */
    if (file_index < argc-1) {
        fprintf(stderr, "%s: only one input file\n", progname);
        usage();
    }
#endif /* TWO_FILE_COMMANDLINE */

    /* Open the input file. */
    if (file_index < argc) {
        // if ((input_file = fopen(argv[file_index], READ_BINARY)) == NULL) {
        //   fprintf(stderr, "%s: can't open %s\n", progname, argv[file_index]);
        //   exit(EXIT_FAILURE);
        // }

        sSize = read_all_bytes (argv[file_index] ,&sMem);
        if(!sSize)
        {
            exit(EXIT_FAILURE);
        }
    } else {
        /* default input file is stdin */
        // input_file = read_stdin();
        exit(EXIT_FAILURE);
    }

    /* Open the output file. */
    if (outfilename != NULL) {
        if ((output_file = fopen(outfilename, WRITE_BINARY)) == NULL) {
            fprintf(stderr, "%s: can't open %s\n", progname, outfilename);
            exit(EXIT_FAILURE);
        }
    } else {
        /* default output file is stdout */
        output_file = write_stdout();
    }

#ifdef PROGRESS_REPORT
    start_progress_monitor((j_common_ptr) &cinfo, &progress);
#endif

    /* Specify data source for decompression */
    //jpeg_stdio_src(&cinfo, input_file);
    jpeg_mem_src(&cinfo,sMem,sSize);
    /* Read file header, set default decompression parameters */
    (void) jpeg_read_header(&cinfo, TRUE);

    /* Adjust default decompression parameters by re-parsing the options */
    file_index = parse_switches(&cinfo, argc, argv, 0, TRUE);

    cinfo.dct_method = JDCT_FLOAT;
    /* Initialize the output module now to let it override any crucial
     * option settings (for instance, GIF wants to force color quantization).
     */
    switch (requested_fmt) {
#ifdef BMP_SUPPORTED
        case FMT_BMP:
            dest_mgr = jinit_write_bmp(&cinfo, FALSE);
            break;
        case FMT_OS2:
            dest_mgr = jinit_write_bmp(&cinfo, TRUE);
            break;
#endif
#ifdef GIF_SUPPORTED
        case FMT_GIF:
            dest_mgr = jinit_write_gif(&cinfo);
            break;
#endif
#ifdef PPM_SUPPORTED
        case FMT_PPM:
            dest_mgr = jinit_write_ppm(&cinfo);
            break;
#endif
#ifdef RLE_SUPPORTED
        case FMT_RLE:
            dest_mgr = jinit_write_rle(&cinfo);
            break;
#endif
#ifdef TARGA_SUPPORTED
        case FMT_TARGA:
            dest_mgr = jinit_write_targa(&cinfo);
            break;
#endif
        default:
            ERREXIT(&cinfo, JERR_UNSUPPORTED_FORMAT);
            break;
    }
    dest_mgr->output_file = output_file;

    /* Start decompressor */
    (void) jpeg_start_decompress(&cinfo);

    /* Write output file header */
    (*dest_mgr->start_output) (&cinfo, dest_mgr);

    /* Process data */
    while (cinfo.output_scanline < cinfo.output_height) {
        num_scanlines = jpeg_read_scanlines(&cinfo, dest_mgr->buffer,
                dest_mgr->buffer_height);
        (*dest_mgr->put_pixel_rows) (&cinfo, dest_mgr, num_scanlines);
    }

#ifdef PROGRESS_REPORT
    /* Hack: count final pass as done in case finish_output does an extra pass.
     * The library won't have updated completed_passes.
     */
    progress.pub.completed_passes = progress.pub.total_passes;
#endif

    /* Finish decompression and release memory.
     * I must do it in this order because output module has allocated memory
     * of lifespan JPOOL_IMAGE; it needs to finish before releasing memory.
     */
    (*dest_mgr->finish_output) (&cinfo, dest_mgr);
    (void) jpeg_finish_decompress(&cinfo);
    jpeg_destroy_decompress(&cinfo);

    /* Close files, if we opened them */
//    if (input_file != stdin)
//        fclose(input_file);
    free_all_bytes(sMem);
    if (output_file != stdout)
        fclose(output_file);

#ifdef PROGRESS_REPORT
    end_progress_monitor((j_common_ptr) &cinfo);
#endif

    /* All done. */
    exit(jerr.num_warnings ? EXIT_WARNING : EXIT_SUCCESS);
    return 0;			/* suppress no-return-value warnings */
}
